Camco Brass Water Pressure Regulator helps to protect the RV and boat plumbing and hoses from damage caused by high-pressure city water. Reduce water pressure to a safe, consistent 40–50psi of operational pressure. Protects appliances, plumbing fixtures, and prevents hose failure, to help prolong equipment life. Female garden hose (3/4 - 11-1/2 NH) x Male garden hose (3/4 – 11-1/2 NH). Patented. For outdoor use only. *Helps protect RV and boat appliances, plumbing fixtures, and hoses from high-pressure city water *Attaches easily with 3/4" garden hose threads *Durable lead-free brass construction that is drinking water safe *Reduces water preassure to a safe and consistent 40-50 PSI of pressure *Compliant with all federal and state level low lead laws.CSA low lead content certified to NSF/ANSI 372